Krameria Rhatany Ratany

Still working on figuring this one out.  Let me know if you recognize it.  Jackie found it in one of her books - Krameria genus, or Ratany, or Rhatany.  I found several patches of it on the land (in central OK)  It's low growing and viny.  Growth habit resembles purslane.  Leaves are alternate and it's hairy. 

Found a great write up on this: http://beetlesinthebush.wordpress.com/2009/08/07/friday-flower-krameria-lanceolata/   In summary:  The flowers produce not nectar, but fatty oils.  Apparently bees of the genus Centris use the oils and pollen for their larvae.  There are other oil producing plants as well!  (who knew?) Also, these plants are "obligate semiparasites, forming haustoria on the roots of a broad range of host plants."